DTC Logic

Diagnosis Procedure
1.CHECK USB HARNESS
Visually check USB harness.
U1243 display unit
U1255 satellite radio tunerAuto light system
Wiring Diagram
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Ground
Ground Distribution
MAIN HARNESS
ENGINE ROOM HARNESS
FRONT END MODULE HARNESS
ENGINE CONTROL HARNESS
BODY HARNESS
BODY NO. 2 HARNESS
...
P0507 ISC system
Description
The ECM controls the engine idle speed to a specified level via the fine
adjustment of the air, which is let into
the intake manifold, by operating the electric throttle control actuator. The
operating of the throttle valve is varied
to allow for optimum control of the engine id ...